JPS593820A - Insulating material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an insulating material used in combination with a water-soluble insulating varnish.

[Technical background of the invention]

Water-soluble insulating varnish contains water, dimethylethanolamine, etc. as solvent components, so if it is used directly with polyester film, etc., it may cause hydrolysis, crystallization, chemical decomposition, etc. when the water-soluble insulating varnish is cured. Chemical changes occur, resulting in deterioration of properties of polyester films, etc.

Therefore, as the insulating material used in combination with this water-soluble insulating varnish, it has been thought that hydrolysis-resistant insulating materials, such as a single limide film, or a laminated material of it and other materials, can be used. There is.

However, each of the above-mentioned insulating materials is extremely expensive and not easy to obtain, and 2. When actually used, for example, as core slot insulators of rotating electric machines, due to cost reasons, for example, polyester film is used as the base material, and both sides of the insulating material are An insulating material with heat-resistant aramid paper laminated as a protective material can be considered, but such a structure would result in a large overall thickness and a poor space factor within the slot.
There were problems such as the mechanical insertion work becoming complicated.

[Purpose of the invention]

An object of the present invention is to provide an insulating material that can effectively prevent characteristic deterioration when used in combination with a water-soluble insulating varnish, with a simple structure using inexpensive and easily available materials.

[Summary of the invention]

The feature of the present invention is that a polyester film is used as a basic material, that is, a base material, and a protective material made of a polyester film is attached to one or both sides of the base material using a highly flexible adhesive. By doing so, the adhesive layer of the s91J ester film lamination of the protective material prevents the chemical effects of solvent components such as water and dimethylethanolamine, which are used in water-soluble insulating varnishes, and prevents the use of profiteering polynis spool film. The purpose is to prevent deterioration of characteristics.

[Embodiments of the invention]

FIG. 1 shows the configuration of an embodiment of the present invention. What is shown in FIG. 1 is 0. Synthetic rubber thread rings 0.025m to 0.075m are attached to both sides of a polyester film 1 made of a polyester film with a thickness of Q75+m to 0.350mm using a highly flexible adhesive.
The insulating material 4 has a three-layer structure (a five-layer structure when the adhesive layer 3 is included) by laminating a protective material 2 made of a polyester film with a thickness of m.

The insulating material 4 of this embodiment is made of a polyester film as a base material.
It is said that When this material, namely the ester film, is used alone in combination with a water-soluble insulating varnish, water contained in the varnish.

The combination of solvent components such as dimethylethanolamine and the temperature and time during varnish curing causes chemical changes such as υ, hydrolysis, and crystallization, and in practical neutrality, the tensile strength test results shown in Figure 2 As shown in characteristic A, the tensile strength increases over time by approximately 5
The bending force decreases to below 0%, and the bending force decreases to about 0% in the epidermal layer.
At a depth of 0.2 m, gaps between walls, etc. occur, which poses a practical problem. On the other hand, in this embodiment, both sides of the polyester film base material 1 are made of the same material, that is, polyester films having a thickness equal to or greater than the inter-wall depth due to chemical action and having a thickness of, for example, 0.025 mm and 0.075 mm. The protective material 2 is laminated and integrated using a highly flexible adhesive via an adhesive layer 3 with a thickness of several micrometers.Then, when used in combination with the water-soluble insulating varnish described above, the above-mentioned solvent The progress of the chemical action that occurs on the polyester film, which is profiteer 1, varies depending on the concentration and time, but under practical conditions of 130°C to 150°C and 7 hours to 25 hours, the progress of the chemical action that occurs on the polyester film, which is profiteering 1, varies from several μ to several tens of μ. By laminating a polyester film having a thickness equal to or more than the depth corresponding to the depth at which this chemical action spreads to the depth in the thickness direction as the protective material 2 to both sides of the polyester film base material 1, double-sided When the polynisdel film protective material 2 undergoes chemical action, its properties change and its characteristics become low F, but the adhesive layer 3 of several micrometers
It has been confirmed through experiments that due to the synergistic effect of the continuous action and the relaxation action, the deterioration of the properties of the base material 1 made of polyester film is significantly improved as shown in property B shown in Figure 2, and that it is possible to maintain practically sufficient properties. It was.

Furthermore, according to Matsuko, it was confirmed that the properties of the polyester film, such as the decrease in flexibility that occur when using a single polyester film, were significantly altered.

This three-layer insulating material 4 has mechanical properties such as tensile strength and end tear resistance during practical use, and short-term properties such as dielectric strength, all of which depend on the polyester film of the base material 1. , the moon of the protective material 2 attached to the screen? As mentioned above, the function of the lyester film is to prevent the chemical action of the solvent poured into the varnish from spreading to the base @1 by the interaction with the adhesives 1 and 43, and to protect the base 11. It is in.

Therefore, in order to satisfy each of the above-mentioned characteristics, the thickness of the polyester film that is the base material 1 needs to be approximately 0.075 am - 0.350 wm, and the protective material to be attached to both sides The thickness of the polyester film in step 2 is determined by the drying temperature and time during varnish treatment, and the penetration depth of the chemical action, which ranges from several micrometers to several tens of micrometers, depending on the wall-to-wall depth due to the bending of the skin layer. Therefore, unless the thickness is approximately 0.025 mm to 0.075 mm, a sufficient protective effect of the base material 1 will not be achieved.
The above-mentioned thickness combinations are optimal.

Note that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications without changing the gist thereof.

For example, since the protective material 2 may be provided on the surface that comes into contact with the water-soluble insulating varnish during use, it may be provided on only one side of the base material 1 instead of on both sides, depending on how it is used.

In addition, the thickness of the polyester films of the base material 1 and the protective material 2 is optimal and basic within the range shown in the above example, taking into consideration processability, insulation properties, and mechanical strength in general applications. However, the key point is that the chemical action of the water-soluble insulating varnish is blocked by the protective material 2 and the adhesive layer 3.
It is only necessary to prevent the thickness from reaching tA and have the required temporality as a whole, so it is not necessarily limited to the above range, but it is necessary to adjust the thickness relationship as appropriate according to the purpose of use. is a possible 11th.

Further, in the above embodiments, the case where the present invention is applied to the winding of a rotating electric machine is mentioned, but the present invention can be similarly applied to general electrical equipment such as transformers and electromagnetic switches.

〔Effect of the invention〕

According to the present invention, a 4:1q structure is used in which polyester vinyl film is used as an insulation film used in combination (impregnation) with a water-soluble insulation varnish, and is laminated with an adhesive as a base material and protection layer. This method prevents the penetration of chemical effects such as hydrolysis and crystallization caused by the combination of water, dimethylethanolamine, etc. contained as solvent components in water-soluble insulating varnish, and the drying temperature and time during varnish processing. It is possible to provide an insulating material that is prevented by the IJ ester film protective material and the adhesive layer, significantly improves the deterioration of the characteristics of the base material with a simple structure, and is inexpensive and easily available.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an insulating material according to an embodiment of the present invention, and FIG.
The figure is a diagram showing an example of the tensile strength test results of the same example. 1... Base material made of polyester film, 2...
Protective material made of polyester film, 3...adhesive layer, 4...insulating material. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] (Insulating material used in combination with water-soluble insulating varnish, in which a polyester film is used as a base material and a protective material made of a polyester film is adhered to at least one surface of the base material using an adhesive.) An insulation film characterized by having a laminated structure. (2. In the insulation material according to claim 1, the protective polyester film has a thickness of approximately 0.025 m to
An insulating material characterized in that it has a thickness of about 0.075. (3) In the insulating material according to claim 2, the base polyester film has a thickness of 0.075 m or more.
An insulating material characterized by having a power of about 0.350W. (4) The insulating material according to any one of claims 1 to 3, wherein the adhesive is a highly flexible synthetic rubber adhesive.